Web Directory? Local? $?

Okay, quick question.
I want to do a localized web directory.
The people who'll be in that web directory need to pay a monthly fee.

My question is.. how do I convince them that, that web directory will be good for them? Also, how do I bring traffic to that? Up until today I never searched, "Web Directory" so I doubt anyone else does it, so how should I go on about it?

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